9. b1d2 The first choice of the computer. Gukesh was still following his preparation. The knight attacks c4 and also prepares to capture on f3. 9... c6c5 A surprising move, probably played in order to take Gukesh out of his preparation. 10. d4d5  10... e7e6  11. h2h3 White had a difficult choice at this point. This move is very natural, but capturing on c4 might be even more accurate.